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Practice for Exam 2
Chemistry 12
Dr. Finley
All answers must be recorded on the Answer Sheet. Only the Answer Sheet will be graded.
You may write on this exam; however nothing you write on this exam will be graded.
Each question is worth 5 points.
1. Which of the following is the ground-state electron configuration of Cl-?
A) [Ne] 3s2 3p6
B)
C)
D)
E)
F)
[Ne] 4s2 4p5
[Ne] 3s3 3p6
[Ne] 3s1 3p6
[Ne] 3s2 3p7
No Correct Response Shown
2. Which of the following atoms has the largest electronegativity?
A) francium
Shown
B) lithium
C) fluorine
D) chlorine E) oxygen
F) No Correct Response
3. Which of the species has the smallest radius?
A) F-
B) Ne
C) O2-
D) Cl
E) Cl-
F) No Correct Response Shown
4. Which of the following is polar?
A) H-H
B) F-F
C) Li-Li
D) N-N
E) O-O
F) No Correct Response Shown
5. Which of the following is a permissible set of quantum numbers for an electron in an atom”
A)
B)
C)
D)
E)
F)
n
l
2
-1
3
2
2
-3
3
2
2
3
No Correct
ml
ms
2
+1/2
-3
-1/2
-2
-1/2
-2
+1/2
0
+1/2
Response Shown
6. This symbol, >, means “is greater then.” A > B, means that “A is greater than B.” Which of the
following orderings of atom/ion size is NOT correct?
A) I- > I > I+
B) Ca2+ > Mg2+ > Be2+
C) Fe > Fe2+ > Fe3+
D) K+ > K > KE) Br > Cl > F
F) No Correct Response Shown
2
7. Look at your periodic table. See the big line that goes through it between B & Al, Si & Ge, . . Te &
Po. Which if the following statements best describes its meaning?
A) All of the metals are on the left.
B) All of the non-metals are on the left.
C) All the atoms on the right are radioactive
D) All the atoms on the right are gaseous at normal temperatures and pressures.
E) All the atoms on the left are gaseous at normal temperatures and pressures.
F) No Correct Response Shown
8. Which quantum number describes the shape of an orbital?
A) principal, n
B) azimuthal, l
C) magnetic, ml
D) spin ms
E) none of them
F) No Correct Response Shown
9. Which of the following transitions in the hydrogen atom produces a photon with the shortest
wavelength? ni means initial state, nf means final state.
A) ni = 1  nf = 4
B) ni = 4  nf = 1
C)
D)
E)
F)
ni = 4  nf = 2
ni = 2  nf = 4
ni = 1  nf = 2
No Correct Response Shown
10. How many d-orbitals are possible in an atom?
A) 1
B) 2
C) 3
D) 4
E) 5
F) No Correct Response Shown
11. What is the total number of lone-pair electron in the Lewis structure for water?
A) 1
B) 2
C) 3
D) 4
E) 5
F) No Correct Response Shown
12. What is the total number of lone-pair electron in the Lewis structure for carbon dioxide?
A) 1
B) 2
C) 3
D) 4
E) 5
F) No Correct Response Shown
13. In the ground-state electron configuration for an oxygen atom how many electrons have an
azimuthal, l, quantum number of three?
A) 0
B) 1
C) 2
D) 3
E) 4
F) No Correct Response Shown
3
14. In the ground-state electron configuration for a helium atom how many electrons have an
principal, n, quantum number of zero?
A) 0
B) 1
C) 2
D) 3
E) 4
F) No Correct Response Shown
15. Atoms with similar outer-most electron structures have similar chemical properties. Atoms with
which of the following electron configurations would be expected to share similar chemical properties?
1s2 2s2 2p2
1s2 2s2 2p6 3s2 3p6 4s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
1s2 2s2 2p6 3s2 3p3
andonly
B) andonly
C) andonly
D) andonly
E) andonly
A)
F) No Correct Response Shown
16. Based on the electron configuration of nitrogen, how many hydrogen atoms are expected to bond
with it?
A) 0
B) 1
C) 2
D) 3
E) 4
F) No Correct Response Shown
4
17. Which of the following represents the outer most electron of a Group
represents some valid principal quantum number?
xs1
xs2
xp1
xp2
IA atom, where the x
xp4
A)  only
B) only
C) only
D) andonly
E) andonly
F) No Correct Response Shown
18. If Na reacts with an element X to form an ionic compound with the chemical formula Na3X, then
your chemical insight would normally expect you to predict that it will react with Ca to from which of
the following molecules?
A) Ca3X
B) Ca2X
C) Ca3X2
D) Ca2X2
E) CaX2
F) No Correct Response Shown
19. Below are three electron configurations drawn by a student learning chemistry. One is correct, one
represents a violation of the Pauli Exclusion Principle , PEP, one represents a violation of Hund’s rule –
The way I taught Hund’s rule in class was to say “every orbital with the same azmithual quantum number,
l get one electron before any orbital gets two electrons.” Choose the answer that correctly matches these
electron configurations.
1s
2s
2p
   _
    
   
is correct, violates the PEP,  violates Hund’s rule.
B) is correct, violates the PEP,  violates Hund’s rule.
C) is correct, violates the PEP,  violates Hund’s rule.
D) is correct, violates the PEP,  violates Hund’s rule.
E) is correct, violates the PEP,  violates Hund’s rule.
F) No Correct Response Shown
A)
5
20. Which of the following equation correctly represents the meaning of electron affinity of an atom, A?
 A- + eB) A  A+ + eC) A  A2- + eD) A  2A- + 2eE) A  2A+ + 2eF) No Correct Response Shown
A) A